The chapter elaborates on a significant issue of pollution faced by the whole world and its consequences. Science chapter 18, "Pollution of air and water", provides requisite information about the numerous sources in the form of gases, toxic water, chemicals that pollute our environments, and their effects on both living or non-living things. This chapter explains how these pollutants contaminate our atmosphere.
The chapter further establishes the role of various toxic and non-toxic gases behind the major atmospheric changes like global warming, acid rains, etc. It reveals the causes of air pollution and their effects, which even lead to death, highlighting how crucial air or water is for our living existence. The dominant air pollutants include-
Additionally, this lesson provides a brief explanation of the sources of air pollutants. These pollutants are produced both by natural or man-made methods. The chapter further outlines the smog causes and its impact on breathing problems. Finally, students study some definite facts about how their daily needs become the main factor behind global warming and learn some cautionary measures that need to be taken to reduce this dominating issue. The chapter also has a segment of the Taj Mahal being damaged by acid rains.
The chapter further describes water pollution causes and their impacts on the different rivers and aquatic ecosystems. the major water pollutants mentioned are-
The chapter focuses on the several diseases caused by drinking contaminated water. It draws attention to a very basic issue that water pollution reduces the amount of potable water. This chapter also teaches multiple ways to purify contaminated water through filtration, chlorination, etc. and develops some plans to make a breathable environment.